*{margin: 0;padding:0;}
ul{list-style: none;}
.clearfix::after{
    content: '';
    display: block;
    clear: both;
}

/* 注意：这里图片路径是相对路径 */
body{
    background: #ccc url(../image/bg.jpg) no-repeat center center;
    background-size: cover;
}

/* header */
header{
    width: 720px;
    height: 44px;
    margin: 100px auto 50px;
}
header .searchEnginPic{
    float: left;
    width: 120px;
    height: 44px;
}
header .searchEnginPic li{
    display: none;
}
header .searchEnginPic li.active{
    display: inline-block;
}
header .searchEnginPic li:nth-child(1) img{
    width: 120px; 
    padding: 2.5px 0;
}
header .searchEnginPic li:nth-child(2) img{
    width: 120px; 
    height: 44px;
}

header .searchBar{
    float: right;
    width: 580px;
    height: 44px;
    border-radius: 24px;
    position: relative;
    background: #fff;
}
header .searchBar:hover{
    box-shadow: 0 1px 6px 0 rgba(32,33,36,0.28);
    border-color: rgba(223,225,229,0);
}
header .searchBar .searchEnginLogo{
    position: absolute;
    left: 10px;
    width: 24px;
    height: 44px;
    cursor: pointer;
}
header .searchBar .searchEnginLogo li{
    display: none;
}
header .searchBar .searchEnginLogo li.active{
    display: inline-block;
}
.searchBar .searchEnginLogo li img{
    width: 24px;
    height: 24px;
    padding: 10px 0;
}
.searchBar input{
    position: absolute;
    left: 46px;
    top: 10%;
    width: 505px;
    height: 80%;
    border: none;
    outline: none;
}
.searchBar .searchBtn{
    position: absolute;
    right: 6px;
    top: 7px;
    width: 30px;
    height: 30px;
    background: url(../image/search-btn.png) center center no-repeat;
    cursor: pointer;
    border: none;
    outline: none;
}

/* main */
.wrapper div{
    width: 850px;
    margin: 0 auto;
    text-align: center;
}
.wrapper .kbd_wrapper{
    display: inline-block;
    vertical-align: top;
    width: 65px;
    height: 55px;
    border-radius: 7px;
    margin: 6px;
    box-shadow: 0 4px 3px 0 #3C3C3D, 0 0 1px 0 #3C3C3D;
    text-align: center;
}
.wrapper kbd{
    position: relative;
    display: inline-block;
    width: 65px;
    height: 50px;
    background: linear-gradient(to bottom, #fff 0%,#fff 70%,#f3f3f3 100%);
    border-radius: 7px;
    box-shadow: 0 5px 0 0 #767d81;
    color: #767D81;
    font-family: Helvetical;
    vertical-align: top;
    line-height: 50px;
    text-transform: uppercase;
    font-weight: bold;
    transition: all .2s linear;
}
.wrapper .kbd_wrapper:hover {
    cursor: pointer;
    animation: shake 0.82s cubic-bezier(.36, .07, .19, .97) both;
    transform: translate3d(0, 0, 0);
    backface-visibility: hidden;
    perspective: 1000px;
}
.wrapper kbd > button{
    display: none;
    position: absolute;
    right: 2px;
    bottom: 2px;
    font-size: 12px;
    width: 16px;
    height: 16px;
    border-radius: 5px;
    border: none;
    outline: none;
    color: #333;
    cursor: pointer;
}
.wrapper kbd:hover > button{
    display: inline-block;
}
.wrapper kbd > button:hover{
    background: #806605;
    color: #fff;
}
.key img{
    width: 16px;
    height: 16px;
    position: absolute;
    left: 4px;
    bottom: 2px;
}
@keyframes shake {
    10%, 90% {
        transform: translate3d(-1px, 0, 0);
    }
    20%, 80% {
        transform: translate3d(2px, 0, 0);
    }
    30%, 50%, 70% {
        transform: translate3d(-4px, 0, 0);
    }
    40%, 60% {
        transform: translate3d(4px, 0, 0);
    }
}

/* footer */
footer{
    width: 390px;
    margin: 50px auto 0;
}
footer h3{
    margin-bottom: 10px;
}
footer .tips-content li{
    padding: 3px 0;
}